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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7de29bc0a79f64c47f46661999b09a9c624df3d57f76b107522a537db2f3b9f8' 
  AND token = 'SA+tYnCp6av7RrrlTYT/44sZ9JRba8McSe1OkLd3s4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}